How does sediment grain size influence habitat suitability for burrowing and filter-feeding organisms?

• A. Fine muds retain water and oxygen poorly; sands drain well and support burrowers; gravels provide interstitial spaces for invertebrates; carbonate sands support corals in suitable zones.
• B. Sands drain well and support burrowers.
• C. Clays always support more organisms than sands.
• D. Coarse gravel sediments are always unsuitable for invertebrates.

Answer: (B)